Tar burner



w. J. DOWNING Jan. 2 6

TAR BURNER [n venor. Y/ram J. Downing'.

m F L 2 2 nd. wvl am. mau 9 QQ "A w 5 mw\ `2 w m 7 n y 3 M FIG-.3

Patented dan. Z6, M3126.

earns WLLIAM J'. DONNG, OF SALISBURY, MARYLAND.

TAR BURNER.

application ined Jury 17, 192s. serial No. 652,190.

To c?? whom it may concern: Y

Be it known that l, WILLIAM J. DowNrNG, a citizen of the United States, and resident of Salisbury, county of iVicomieo, and State of Maryland, have invented an Improvement in Tar Burners, of which the following is a specification.

rThe object of my invention isto provide satisfactory burner apparatus especially adapted for burning heavy tar products from gas works commonly known as gas tar, but which may also be employed in burning heavy oil products for generating steam in boilers or other special purposes; and wherein the combustion of the same with mixtures of steam and air is so perfect that an intense white heat may be produced without smoke or objectionable fumes arising from the smoke stack. l

My invention comprehends not only iniprovements in the burner apparatus proper, but also in the means of controlling the supply of the gas tar or heavy oil in conjunction withthe control of the air and steam, involving means which will enable the gas tar to be delivered to the burner always un der constant conditions.

.With the above and other objects in view, the nature of which will be more fully understood from the description hereinafter, the invention consists in the novel construction of tar burners, as hereinafter more fully described and defined in the claims.

Referring to the drawings: Fig. 1 is a vertical section through the burner apparatus embodying my invention; Fig. 2 isa transverse section of the same, taken on line 2-2; and Fig. 3 is a diagrammatic elevation showing the means for feeding heavy gas lar to the burner and constituting a part of my burner apparatus.

Ordinarily, in gas works, the gas tar is pumped to a reservoir or tank at a sufficient elevation to insure its flow by gravity, and in F ig. 3, pipe 2 leads from the reservoir and is provided with a control valve 3 for delivering` the tar to a receiving tank 4 which may have a convenient capacity for supplying` tar to the burner for a given period, such as one day, so that the supply of gas tar provided. by the receiving tank i will not need any special attention but once a day. 5 is a pump which may be of any suitable character and draws its supply of tar from the tank d by a suction pipe 6 and delivers it by a pipe 7 to the receiving .cup 8 of the burner proper 9. This cup 8 is provided with an overflow 10 by which any eX- cess of tar may flow back into the tank t. 1n practice, the nozzle 11 on the end of the pipe 7 is slightly above the cup 8, so as to provide a ysight lfeed arrangement whereby the engineer may know for a certainty that the proper flow of gas tar is being delivered by the pump. It will be understood, howev r, that I do not restrict myself to this sight feed. The advantage of employing the tank 4 from which the pump 5 draws its supply oftar instead of delivering the tar from pipe 2 directly to the pump 5 resides in the fact that the overflow from the cup S would not work properly if pressure were applied to the discharge, as the tar would bypass through the overiiow and prevent its operation.

Referring now more particularly to the construction of the burner proper shown in detail in Figs. 1 and 2,12 isa cast metal body having a tar inlet 18 and anV air inlet 14, and a steam inlet the tar inlet eX- tending downward and curved in a horizontal direction and terminating in a 'nozzle 16, i

the passage being preferably somewhat increased in cross section at 17 for reasons which willbe presently described. The air i passage 14: extends obliquely downward and forward Surrounding the walls of the tar passage, whereby the air is delivered adjacent to the tar nozzle 16 in an lannular current at 18. 13? is a pipe extending downward from the cup 8 and screwed .into the tar inlet 13 of the body, and while it is preferable that this pipe is a relatively short straight section, I do not limit myself in this respect, as the cup may be located at Some distance from the body of the burner, if so desired, and the shape of the pipe 13a would be modied accordingly.

Screwed into the body at the discharge end of the air passage 19 is a pipe 2O of relatively large diameter and preferably tapered on its inlet end, as at 21, for directing the air current in a more or less conical form to insure its impinging upon the current of tar and steam which emerges from the nozzlev16. The pipe 20 extends through the furnacewall or metal frame 22 in any suitable manner and preferably provided with suitable air dampers 23 for supplying the furnace with additional air. he intake end of the air passage 14 is perforated, as at $24-, and an adjustable damper regulator 25 is pivoted thereto at 26 and may be frictionallv held in position by a spring 27, or may be formed in any other convenient manner for insuring the proper predetermined amount of air for producing the proper admixture with the tar to insure perfect combustion.

28 is a steam nozzle which is screwed linto the part 15 of the body and forms a snug fit through a hole 29 in the enlarged `part 17 of the tar passage between the inlet 13 and its nozzle portion 16, and this steam nozzle is preferably tapered on its end which projects into the tar passage. The enlargement of the part 17 provides a space into which the tip ofthe steam nozzle 28 may -project without reducing materially the cross sectional area of the tar current. The steam nozzle 28 is provided with a valve seat 3() with which a needle valve 31 cooperates in the control of the steam, and this needle valve may be supplemented with a conical valve piece 32 for more positively seating at 33 in the nozzle when steam is finally shut olf. The needle valve maybe employed for nicer regulations in the change of steam supply, while keeping the direction of the steam current lengthwise of the nozzle, whereby its force is not expended. in abrupt turn. The valve parts 31 and 32 are formed on the end of a valve stem 311 which is screw threaded to be adjustable at 35 in the bonnet 36 of the steam valve body 37 which screws upon the hub 38 of the main body 12. This body 37 has a lateral outlet 39 into which the steam supply pipe i() is screwed. The bonnet 36 is provided with a suitable stuffing box 41 and the valve stem may be operated by a hand wheel 42 secured yto the end thereof.

It will now be understood that the gas tar is supplied to its nozzle 16 under a normal gravity pressure governed by the static headbetween said nozzle and the level of the tar in the cup 8, and this static headv is limited in extent so that there is no excessive pressure from that cause. and consequently,

dependence is put upon the steam control for properly and rapidly moving the tar through its supply passage. The steam impinges upon the tar in the nozzle portion 16 and causes it to be finely sub-divided where it enters the tubular pipe section 20, and producing in the air nozzle portion 18a strong draft or suction which draws in the air through the damper 25 and the air passage around the steam and tar nozzles, causing said air to be intimately mixed with the steam and tar particles and gases, so that when the said mixture of steam, aii and tar products leaves the tubular pipe or nozzle 20 and is delivered into the furnace proper, the mixture is in the most excellent condition for immediate final and perfect combustion with the air supplied through the yand consequently provide a maximum evaporation for a given consumption of tar.

While the burner and apparatus constituting my invention is specially designezl for burning gas tar, it will be understood that it may be also used for any other hydrocarbon fluid compound, such as extremely heavyT oils or waste products, where the same are available.'

It will now be apparent that have devised a novel and useful construction which embodies the features of advantage enumerated as desirable, and while I have in the present instance shown and described the preferred embodiment thereof which has been found in practice to give satisfactory and reliable results, it is to be understood that I do not restrict myself to the details, as the. same are susceptible of modification in various particulars without departing from the spirit or scope of the invention.

Having now described my invention, what I claim as new and desire to secure by Letters Patent is l. In a burner apparatus, a. combined nozzle device comprising a hydrocarbon passage having a nozzle end, a steam passage entering the hydrocarbon passage and provided with a nozzle end extended into the passage and directed toward but arranged at a distance from the ynozzle end of the hydrocarbon passage so that the hydrocarbon material may flow around the steam nozzle and the steam impinge directly upon it to subdivide it and form a thorough mixture before leaving the said hydrocarbon nozzle, an air passage surrounding the hydrocarbon passage and terminating in an annular nozzle immediately about the hydrocarbon nozzle, means for supplying and cont-rolling steam to the steam passage whereby the extent of its discharge within the hydrocarbon nozzle may be regulated, a cup for receiving hydrocarbon material arranged at a considerable ele vation above the hydrocarbon nozzle and in communication with it by a vertical pipe to provide a definite static head for feeding the hydrocarbon material downwardly against the pressure in the nozzle, and means for delivering the fluid hydrocarbon material to the cup.

2. The invention according to claim 1, wherein the cup is freely open to the atmosphere at its upper end and is provided with an overow pipe opening therefrom below its top, and the means for supplying hydrocarbon material to the cup has a delivery nozzle at an elevation above the. overow pipe.

3. yThe invention according to claim 1, wherein further, the air passage to the nozzle is pro-vided with means to control the inflow of air, and a large additional annular damper controlled air passage is extended about the burner nozzle portion for providing a regulated supply of additional air to the space immediately about the hydrocarbon burner.

4. The invention according to .claim l, wherein the steam passage is provided with a needle valve passage and a conical seat at its intake end, said nozzle valve passage directed toward the hydrocarbon nozzle, and the controlling means for the steam comprises a valve stem having a needle valve end adapted to the needle valve scat and an additional conical seating portion adapted to the conical seat, the construction being such that when the conical seating portion is tight upon its seat the needle valve portion is very slightly away from the needle valve passage.

5. In a burner apparatus, a combined nozzle device comprising a hydrocarbon passage having a nozzle end, a steam passage entering the hydrocarbon passage and provided with a nozzle end directed toward but arranged at a distance from the nozzle end of the hydrocarbon passage so that the steam impinges directly upon the hydrocarbon material to subdivide it and form a thorough mixture before leaving said hydrocarbon nozzle, an air passage surrounding the hydrocarbon passage and terminating in an annular nozzleiimmediately about the hydrocarbon nozzle, means for supplying and controlling steam to the steam passage whereby the extent of its discharge within the hydrocarbon nozzle may be regulated, a cup for receiving hydrocarbon materia-l arranged at a considerable elevation above the hydrocarbon nozzle and in communication with it by a vertical pipe to provide a delinite static head for feeding the hydrocarbon material downwardly against the pressure in the nozzle., and means for delivering the fluid hydrocarbon material to the cup, and where-in further, there is combined with the burner a receiving tank for the hydrocarbon material, a nozzle for delivering hydrocarbon fluid to the' cup, a pump for forcing the material from the receiving tank to the nozzle which discharges into the cup of the burner, and overflow pipe from the cup extending to the receiving tank for delivering the overflow thereto.

In testimony of' which invention, I hereunto set my hand.`

WILLIAM J. DOWN ING. 

